LARP is an acronym! It stands for Live Action Role Play.
Live Action Role Play is classification of gaming with the foundational aspect being a real-time, physical acting out of a role/character within a set rules system. This differs from other role-playing games where you only say/roll/click/type what your character would do.
How the game is played depends on the specific LARP, as each has its own rules system. Like any other structured game, there is almost always a rulebook to describe the exact system of play. Different LARPs can be as different as basketball from football- just because both of those use balls and are both categorized as “competitive team sports” doesn’t make them very comparable beyond that. The same logic applies to different LARP games.
Alliance LARP differs itself from most other LARPs in that it is a role-playing game with some battles, rather than a battle game with some role-playing. Emphasis on character development, complex plots, and fantastic costuming also help distinguish Alliance from other LARPs. In all aspects of LARPing, from costumes to combat, Alliance strives to be the best.